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We read the Bible because it is the inspired word of God and understanding it is essential for our salvation:
Acts 20:32 And now, brethren, I commend you to God, and to the word of his grace, which is able to build you up, and to give you an inheritance among all them which are sanctified.
2 Timothy 3:14 But continue thou in the things which thou hast learned and hast been assured of, knowing of whom thou hast learned them; 15 And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus. 16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: 17 That the man of God may be perfect, throughly furnished unto all good works.
1 Timothy 4:13 Till I come, give attendance to reading, to exhortation, to doctrine...15 Meditate upon these things; give thyself wholly to them; that thy profiting may appear to all. 16 Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee.
Romans 15:4 For whatsoever things were written aforetime were written for our learning, that we through patience and comfort of the scriptures might have hope.
1 Corinthians 10:11 Now all these things happened unto them for ensamples: and they are written for our admonition, upon whom the ends of the world are come.
2 Peter 1:20 Knowing this first, that no prophecy of the scripture is of any private interpretation. 21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Spirit.
We read the Bible because it contains the gospel in written form which we are required to believe:
Mark 16:15 And he said unto them, Go ye into all the world, and preach the gospel to every creature. 16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
We read the Bible because it is the only source of faith (belief) that we have:
Romans 10:12 For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him. 13 For whosoever shall call upon the name of the Lord shall be saved. 14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? 15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things! 16 But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report? 17 So then faith cometh by hearing, and hearing by the word of God.
We read the Bible to check that what we believe is what is written in the Bible. There have been and are many false prophets in this world (this is blindingly obvious by the number of different churches).
Acts 17:11 These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
Matthew 24:24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
2 Timothy 4:3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears; 4 And they shall turn away their ears from the truth, and shall be turned unto fables.
We pray because in believing the gospel and being baptised into Christ we become sons of God and have a relationship with God as our Father. We cannot have a relationship with God if we do not speak to him.
Matthew 6:9 After this manner therefore pray ye: Our Father which art in heaven, Hallowed be thy name.
We pray because Christ commands us to pray for our enemies:
Matthew 5:44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
We pray because Christ commands us to ask for what we need (not want):
Matthew 7:7 Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you: 8 For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened.
We pray because Christ commands us to pray always:
Luke 18:1 And he spake a parable unto them to this end, that men ought always to pray, and not to faint;
We pray for deliverance from the judgments to come upon this evil world:
Luke 21:36 Watch ye therefore, and pray always, that ye may be accounted worthy to escape all these things that shall come to pass, and to stand before the Son of man.
We pray because Paul instructs us to pray:
Romans 12:12 Rejoicing in hope; patient in tribulation; continuing instant in prayer;
Ephesians 6:18 Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
Philippians 4:6 Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
Colossians 4:2 Continue in prayer, and watch in the same with thanksgiving;
1 Timothy 2:1 I exhort therefore, that, first of all, supplications, prayers, intercessions, and giving of thanks, be made for all men;
We pray because James exhorts us to pray for one another:
James 5:16 Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
We pray for forgiveness of our sins:
1 John 1:7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin. 8 If we say that we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
I hope this helps.